Engraving-machine



C. R. ZIMMERMAN.

ENGRAVING MACHINE.

APPLICATION mu) JULY 3,1920.

1,388,687, Patented Aug. 23, 1921 2 SHEETSSHEET IIIJ IHHIIIIHHHHHIIHHPHHIIIH Svwewtoz U/mrlea Hal ah Zimmerman Gum/n Md c. R. ZIMMERMAN.

ENGRAVING MACHINE.

APPLICATION FILED JULY 3,1920- 1,388,687. Patented Aug. 23, 1921.

2 SHEETS-SHEET 2.

G/m IZBS Hui oh Zz' mmerman UNITED STATES PAJ'ENT OFFICE.

CHARLES RALPH ZIMMERMAN, OF MEMPHIS, TENNESSEE.

ENGRAVING-MACHINE.

Application filed July 3, 1920. Serial No. 393,948..

To all to from it may concern Be it known that I, CHARLES RALPH ZIM- MERMAN, a citizen of the United States, residing at Memphis, in the county of Shelby and State of Tennessee, have invented certain new and useful Improvements in an Engraving-Machine, of which the following is a specification.

This invention relates to improvements in engraving machines of the type wherein movement of the stylus tracing the figure or design on the master plate is conveyed to the carriage for the reproducing needle through the transmitter, and the principal object of the invention is to provide a novel type of universal fulcrum for the transmitter possessing such improved features of adjustment as to afford a maximum range of variation of both lateral and longitudinal scales of reproduction whereby both the width and height of the reproduction may be varied to any desired extent with relation to the proportions of the figure or design on the master plate.

lVith these and other objects in view, the invention consists in certain novel features of construction as hereinafter shown and described and then specifically pointed out in the claims and in the drawings illustrative of the preferred embodiment of the invention.

In the accompanying drawings:

Figure 1 represents a fragmental front elevation of an engraving machine illustrating the invention applied thereto.

Fig. 2 represents a fragmental side eleva tion of the machine.

Fig. 3 represents a horizontal sectional view through the transmitter looking down wardly upon the universal fulcrum.

Fig. 4 represents a transverse sectional view on the line ll of Fig. 3, and,

Fig. 5 represents an enlarged elevation partly in section, of one of the fulcrum points for the transmitter receiving sleeve.

Referring to the drawing in detail, where in similar reference numerals designate corresponding parts throughout the several views, the numeral 10 indicates the usual column upon which the carriage (not shown) is mounted for universal movement in a horizontal plane and which carries the usual reproducing needle. A rack bar 11 is attached to the column 10 and coacts with a pinion 12 rotatably mounted in a sleeve 13 which latter is adapted for vertical adjust ment upon the column 10 and is secured in adjusted position by means of a thumb screw 14.

The vertically adjustable sleeve 13 is provided with a bracket 15 the arms of which are apertured and threaded to receive the bolts 16 having pointed inner extremities selectively engageable in a series of recesses 17 formed in the ring 18 and a pair of de pending extensions 19 carried thereby whereby the elevation of the ring 18 may be varied desired by engaging the pointed extremit1es of the screws 15 in the proper recesses 17 of the ring and extensions 19.

At points intermediate the diametrically opposed extensions 19, the ring 18 is provided internally with opposed recesses 20 having undercut side walls 21 coacting with the ad ustable strips 22 to prevent accidental displacement of the latter from the recesses. The strips 22 are retained in adjusted positlon with relation to the ring 18 by set screws 23havingpolygonal enlarged outer extremities for convenience in adjustment thereof and the inner surfaces of the strips are provided with a series of vertically spaced recesses 24 selectively engageable by the pointed extremities of fulcrum screws 25. The points 26 of the screws 25 are in the form of sockets capable of adjustment longitudinally of the screws and said sockets are secured in adjusted position by lock nuts 27.

The inner threaded extremities of the screws 25 are fitted in a substantially rectangular sleeve 28 receiving the transmitter bar 29 on which the sleeve 28 is mounted for longitudinal adjustment, in the usual manner. The upper extremity of the transmitter is connected inthe usual manner by a universal joint with the carriage, (not shown) whereby movement of the lower extremity of the transmitter carrying the stylus (not shown) is reproduced in the movement of the carriage on which the reproducing needle is supported.

I am aware that engraving machines, heretofore have been equipped with the vertically adjustable sleeve 13 for changing the position of the universal fulcrum of the transmitter whereby the scale of the reproduction may be varied, as desired. Likewise I am aware that in these types of machines the fulcrum ring 18 has been capable of vertical adjustment relative to the bracket 15 in order to vary the lateral scale of the reproduction. However, I believe it to be broadly new to provide for the adjustment of the fulcrum points 26 with relation to the ring 18 whereby the longitudinal scale of the reproduction may be varied as well as the lateral scale.

What I claim is:

1. In a universal fulcrum for the transmitter of an engraving machine, an intermediate supportlng element having an ad- 'ustable pivotal mounting, recessed memers carried by the supporting element arranged intermediate the pivotal mountings of the latter, a transmitter engaging element, and adjustable pivotal members carried by the transmitter engaging element relatively engageable in the recesses.

2. n a universal fulcrum for the transmitter of an engraving machine, an intermediate fulcrum having an adjustable pivotal mounting, independent members mounted in the intermediate fulcrum for sliding adjustment therein and a transmitter engaging element pivotally supportedin, and adjustable with the independent members.

3. In a universal fulcrum for the transmitter of an engraving machine, an intermediate supporting element mounted for pivotal movement, opposed and independent members mounted inv the intermediate supporting element for sliding adjustment therein, and a transmitter engaging element pivotally mounted in the slidably adjustable members and adjustable therewith.

4. A universal fulcrum for the transmitter of an engraving machine comprising an adjustably and pivotally mounted intermediate supporting element, a transmitter engaging element, members adjustably mountindependent sliding movement and having series of recesses therein, and fulcrum points adjustably connected to said engaging element and selectively engageable in the recesses and adjustable with said opposed members or capable of adjustment with respect thereto.

6. A universal fulcrum for the transmitter of an engraving machine comprising an adjustably and pivotally mounted intermediate supporting element, a transmitter engaging element, said intermediate supporting element having opposed recesses therein provided with undercut side walls, opposed members mounted for inde endent sliding adjustment in the recesses of the intermediate supporting element, means to secure said opposed members in adjusted position relative to the intermediate supporting element, and fulcrum points carried by the transmitter engaging elements and engaged and adjustable with said opposed members.

In testimony whereof, I affix my signature hereto.

CHARLES RALPH ZIMMERMAN. 

